MAC Vendor Lookup
Identify the hardware vendor associated with a MAC address OUI prefix.
About MAC Vendor Lookup
The first 24 bits (3 bytes) of a MAC address form the Organizationally Unique Identifier (OUI), assigned by IEEE to hardware manufacturers. Looking up the OUI reveals the device's manufacturer. The two least-significant bits of the first byte indicate whether the address is unicast/multicast and universal/local.
Formula
OUI extraction
OUI = first 3 bytes (6 hex digits) of the MAC address
- OUI
- Organizationally Unique Identifier, registered with IEEE
Worked example
With the default values below, MAC Vendor Lookup returns Vendor / Manufacturer of Ayecom Technology. Change any input above and every figure here is recalculated in your browser.
Inputs used
- MAC Address
- 00:1A:2B:3C:4D:5E
Results
- Vendor / Manufacturer
- Ayecom Technology
- OUI (First 3 Bytes)
- 00:1A:2B
- Address Type
- Unicast / Universally Administered
Step by step
- 1Extract OUI (first 3 bytes)= 00:1A:2B
- 2Check I/G bit (LSB of first byte)= 0 (Unicast)
- 3Check U/L bit (2nd bit of first byte)= 0 (Universal)
Assumptions and limits
- The result is derived only from the single input listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
What if the OUI shows 'locally administered'?
A locally administered address (U/L bit set) means the MAC was assigned by software rather than burned into hardware by the manufacturer — common for virtual machines, privacy-randomized mobile devices, and software-defined networking. The OUI won't identify a real hardware vendor in this case.
Where is the complete OUI database?
IEEE maintains the authoritative OUI registry at standards.ieee.org/products-programs/regauth. It contains over 30,000 registered OUIs. This calculator uses a common subset for offline identification.